The IESG has approved the following document: - 'RTP Control Protocol (RTCP) Extended Report (XR) Block for Delay metric Reporting' (draft-ietf-xrblock-rtcp-xr-delay-12.txt) as Proposed Standard This document is the product of the Metric Blocks for use with RTCP's Extended Report Framework Working Group. The IESG contact persons are Gonzalo Camarillo and Robert Sparks. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-xrblock-rtcp-xr-delay/ Technical Summary This draft defines a new block type to augment those defined in [RFC3611] for use in a range of RTP applications. The new block type supports the reporting of the mean, minimum and maximum values of the network round-trip delay between RTP interfaces in peer RTP end systems as measured, for example, using the RTCP method described in [RFC3550]. It also supports reporting of the component of the round- trip delay internal to the local RTP system. Working Group Summary There were several points of debate within the working group; however, none were particularly rough and authors and commentators came up with the text that resolves any issues thus consensus was achieved in all cases. One issue that was discussed extensively during WGLC was the precision of measurement in round trip delay (affecting mean/max/min) as well as permitted delay of 1 second or more. After bringing in reference from other forum such as Broadband Forum and ITU, WG agreed that delay of 1 seconds or more was to be accommodated along with ability to come up with precision of microseconds (1/65536 seconds) for measuring the delay. Document Quality This document has been reviewed by numerous people within XRBLOCK and through two rounds of WGLCs the document resolved any outstanding issues. Personnel Shida Schubert is the Document Shepherd. Gonzalo Camarillo is the Responsible Area Director.
